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a: 5/7=25/35
12/5=84/60
b: 2/3=30/45
4/5=36/45
8/9=40/45
1/3 và 3/4
Ta có : \(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)=\(\frac{4}{12}\)
\(\frac{3}{4}\)= \(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
a)\(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)= \(\frac{4}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
b) \(\frac{3}{2}\)=\(\frac{3x21}{2x21}\)=\(\frac{63}{42}\)
\(\frac{2}{3}\)=\(\frac{2x14}{3x14}\)=\(\frac{28}{42}\)
\(\frac{5}{7}\)=\(\frac{5x6}{7x6}\)=\(\frac{30}{42}\)
a, `5/6` và `13/8` (MSC: 24)
`5/6 = (5 xx 4)/(6 xx 4) = 20/24`
`13/8 = (13 xx 3)/(8 xx 3) = 39/24`
b, `4/15` và `5/72` (MSC: 360)
`4/15 = (4 xx 24)/(15 xx 24) = 96/360`
`5/72 = (5 xx 5)/(72 xx 5) = 25/360`.
bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
\(\dfrac{3}{4}\) = \(\dfrac{3.5}{4.5}\) = \(\dfrac{15}{20}\); \(\dfrac{4}{5}=\dfrac{4.4}{5.4}\) = \(\dfrac{16}{20}\)
\(\dfrac{4}{7}\) = \(\dfrac{4.9}{7.9}\) = \(\dfrac{36}{63}\); \(\dfrac{5}{9}\) = \(\dfrac{5.7}{9.7}\) = \(\dfrac{35}{63}\)
\(\dfrac{5}{12}\) = \(\dfrac{5.3}{12.3}\) = \(\dfrac{15}{36}\); \(\dfrac{4}{9}=\dfrac{4.4}{9.4}\) = \(\dfrac{16}{36}\)
\(\dfrac{7}{9}=\dfrac{7.8}{9.8}\) = \(\dfrac{56}{72}\) ; \(\dfrac{5}{8}\) = \(\dfrac{5.9}{8.9}\) = \(\dfrac{45}{72}\)
a) \(\dfrac{5}{5}\) và \(\dfrac{4}{5}\)
b) \(\dfrac{5}{9}\) và \(\dfrac{18}{9}\)
c) \(\dfrac{15}{5}\) và \(\dfrac{9}{5}\)
d) \(\dfrac{16}{4}\) và \(\dfrac{3}{4}\)
a: 1=5/5
4/5=4/5
b: 5/9=5/9
2=18/9
c: 3=15/5
9/5=9/5
d: 4=16/4
3/4=3/4
a: 4/7=48/84
5/12=35/84
b: 3/8=9/24
19/24=19/24
c: 21/22=21/22
7/11=14/22
d: 8/15=128/240
11/16=165/240
e: 4/25=16/100
72/100=72/100
f: 17/60=17/60
4/5=48/60